Furnace for roasting ores.



N. L. HEINZ & w. H. FREELAND. runmon FOR ROASTING nus.

APPLICATION FILED MAY 25, 191'0.' I 986,709, Patented Mar. 14, 1911.

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11. L. HEINZ 1 W. H. PREELAND. FURNAGE FOR ROASTING ORES. APPLICATION FILED HAY 2 5, 1910.

Patented Mar.14,1911.

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'-N. L. HEINZ & W. H. FREELAND.

FURNACE FOR ROASTING omas.

v APPLICATION FILED MAY 25, 1910.

986,709 Patented Mar. 14, 1911.

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. UNITED STATESPATENT OFFICE.

NICHOLAS L. HEINZ, OF LA SALLE, ILLINOIS, AND WILLIAM H. FREELAND, F

. ISABELLA, TENNESSEE.

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Specification of Letters Patent.

' vided, each consisting of an arch floor sup- 986309. I Patented Mar. 14, 191i.

Application filed May'25,-191 0. Serial No. 563,404.

To all whom it may concern: I ported at its outer edge on the wall of the 55 Be it known that we, NICHOLAS L. HEINZ, shell so as to; sustain its weight and the of La Salle, in the county of Lasalle and Weight of the ore passing on the hearths. State of Illinois, and WILLIAM H. FREE. A vertical rotary shaft 10 passes upthrough LAND, of Isabella, in the county of Polk openings at the center of the hearths and is;

and State of Tennessee, have invented cerconnected with the gear 8., The shaft has '60 tain new and'useful Improvements in Furradial rakes 11 which are provided withnaces for Roasting Ores, of which the'folteeth 11 set inclined to the path of their I lowing is a specification. travel when the shaft is rotated, and de- Our invention relates to that class of signed onsome of the hearths to throw the.

roasting furnaces which have a series of ore outward to the periphery of the hearth 65 superimposed hearths or ovens, through and on others to pull it in to the center. The n which the ore is successively passed from adaptation of'the rakes is such, in the presthe upper in a zig zag course down on the cut instance, that ore fed into-the upper .15 lower ones and out at the bottom one. 'In heart-h will be pulled to-the center thereof I furnaces of this class it has been found and caused to fall down through central 70 that the middle and upper hearths get hotter opening a, Fig. 4, on the next hearth below, than necessary while in the lower ones, where the rake is adapted-to push the ore where the sulfur in the ore becomes more out to the periphery of the hearth, and cause and more dilute, the temperature is prone to it to fall through peripheral openings 6 on fall below what is desired. to the third hearth below. and so on down 75' It is the chief object of our improvement through the furnace, causing its discharge to provide-a furnace of the classmentioned at the bottom. Y in which drafts of hot air over the hearths Each of the hearth arches, except the top or through the ovens are arranged to transand bottom ones, is provided with a low I fer the heat from the upper hearths 'where chamber 12 or 12 which covers substantially 80 there is an excessof heat to the lower ones the entire hearth area. in order to supply the heat deficiency found I The shell walls are provided with down in them and maintain a more nearly uniform fl ues 13 throughfwhi'ch air from the outside temperature throughout the entire furnace. is forced down. on one side into'the upper We have attained this object in the furnace chamber 12 through which it circulates to $5 constructed as'illustrated in the accomthe opposite side and thence passes downpanying drawings in whichthrough fines 13 into the next lower cham- "Figure 1. is a side elevation, partly in her 12 through which it passes in the op vertical section, of a furnace containing our posite direction and so on downthrough all invention. Fig. 2is a top or plan View of' such chambers to and into the last one 12*, 90

the same. Fig. 3 is a horizontal section as indicated by arrows showing direction of taken at the line 3 3 of Fig.4. Fig. 4 is a the air movemert therein. Preferably said 1 vertical section or rather'three vertical secchambers have a partition 12 by means of 40 tions, one of the upper part A being on the which the air may be made to circulate back line A A of Fig. 6, one of the part B being and forth in each chamber: before passing 95 on the line B B of Fig. 3, and one of partC, to the next one. below I being on the line C C of Fig. 6. Fig. 5 is a The chambers 12 are heated by the burnhorizontal section on the line 5 5 of Fig. 4:. .ing of the ores on the hearth's, and the air"- Fig. 6 is a horizontal section on the line 6 6 circulated throu h them is heated and of Fig. 4. passed finally into chamber 12*;whichf'is r00 Like signs marked on the drawing indithe distributer of the hot air to the ovens cate like parts-throughout the several views. or hearths below andahove. For this pur+ The vertical shell 7 of the furnace is of pose a-series of up fines let is provided in brick work, and of any suitable size. It is theshell'walls which communicate with said preferably supported on a steel frame work chamber 12 and lead from it to the hearth for a foundation with driving gear. 8'." In below and to all the hearths above the chamthe present instance six hearths 9 are prober 12, short branch flues l4 being provided through which the distributed hot air upon the upper hearth from the hopper.

- The shell is provided with openings 19 having doors 20 for closing them at the points where the peripheral openings 11 are located, and air ports 21 with doors 22 for closing them are provided in conjunction with the upfiues 14: and their branches 14?. These are for inspecting the furnace and egulating the working of the same. The

furnace can be fired with producer gas or in any of the well known ways.

By heating ingoing air currents in the chambers12'of the hearth arches and dis tributing it in the ovens in' the manner shown a more uniform temperature can be maintained throughout the entire furnace and on all the hearths than heretofore.

The furnace constructed as we have above described not only possesses comparatively higher efiiciency for the treatment of all ordinarily workable grades of ore, but; is particularly valuable for thetreatment of the lower-grades, and it has been successfully used for working ores of such low grade as to be thought not workable.

What we claim is:

1. In an ore roasting furnace of the class described, the combination with the shell of a series of superimposed chambered arches, a set of fines connecting said chambers of the arches with one another and with the outer atmosphere, and another set of 'flues connecting one of said arch chambers with the several hearths, as and for the purpose specified.

2. In an ore roasting furnace of the class described, the combination with the shell of a series of superimposed ovens separated by chambered arches provided with openings for the passage of theore, a set of fines in the shell for connecting the arch chambers with one another and with the outer atmosphere at the top, and another set of flues in the shell for connecting one of said arch chambers with the several ovens, as and for the purpose specified.

3. In an ore roasting furnace of the class described, the combination with the shell. ofa series of superimposed ovens separated by chambered arches provided with openof said archesbeing provide ings for the passage of the ore, a series of rotary rakes in said ovens and adapted to work the ore toward said openings, fines connecting said arch chambers with one another and with the outer air, and lines connecting one of said chambers with the ovens, as specified.

4;. In an ore roasting furnace of the class described, the combination with the furnace shell of a series of superimposed chambered arches forming roasting ovens the chambers d Withcentral partitions 12*, a flue connecting said chamthe outer atmosphere, and another flue c0nnecting one of said arch chambers, 12*, with the several ovens, as and for the purpose specified.

-5. In an orc roasting furnace of the class described, the combination with the shell provided with down flues communicatingv with the outer air of a plurality of chambered arches connected with saiddown fines ,and adapted to serve as-roasting hearths,

for heating air taken into such chambers and transferringit from the uppermost and middle portions of the furnace to the lower portion, as and for the purpose specified.

6. In an ore roasting furnace of the class described, the combination with the shell provided with up-flues of a plurality of superimposed ovens or hearths connected with said up-flues'and a hot air chamber located below the middle portion of the furnace and .communicating with said up-fiues for distributing hot air to the ovens below and above said hot air chamber, as specified.

7. In an ore roasting furnace of the class described, the combination with the shell provided with a set of down-fines and a set of up-fiues of a series of superimposed chambered arches adapted to serve as hearths, the chambers of said arches being connected withone another and with the outer atmos phere by said down-flues, and the lowermost of said arch chambers being connected with all the hearths, as and for the purpose speci- NICHOLAS L. HEINZ. WILLIAM H. FREELAND.

Witnesses ture here of the arches with one another and with to Nicholas L. 'I-Ieinzs signa- E. L. LAVISON, D. B. TURNER. Witnesses to William H. Freelands signature:

R. M. KENNY, v A. REDMAN. 

